This category is a distinct from food additives.
An individual firm makes a conclusion that a use of a substance is GRAS. It may voluntarily notify the FDA of its conclusion, and FDA will then provide comments as to whether or not the agency agrees the body of information support the conclusion.
The FDA response letter is posted online in a database of all GRAS notifications that are filed. The FDACVM and the FDA Center for Food Safety and Applied Nutrition (CFSAN) maintain two separate lists - one for animal uses and one for human uses.
GRAS notifications receiving a no questions letter from FDA-CVM will also be listed in the AAFCO Official Publication. This is an advantage to submitting a notice to the FDA-CVM, as once published in the OP, States generally will not question your use of the ingredient on labeling of livestock feed and pet food.